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feilong is a suite of core and expanded libraries that include utility classes, http, excel,cvs, io classes, and much much more.
// --------------------------------------------------------------------------
// Copyright (c) 1998-2004, Drew Davidson and Luke Blanshard
// All rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are
// met:
//
// Redistributions of source code must retain the above copyright notice,
// this list of conditions and the following disclaimer.
// Redistributions in binary form must reproduce the above copyright
// notice, this list of conditions and the following disclaimer in the
// documentation and/or other materials provided with the distribution.
// Neither the name of the Drew Davidson nor the names of its contributors
// may be used to endorse or promote products derived from this software
// without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
// FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
// COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
// INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
// BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
// OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
// AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
// OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF
// THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH
// DAMAGE.
// --------------------------------------------------------------------------
package com.feilong.lib.ognl;
import java.lang.reflect.Method;
import java.util.ArrayList;
import java.util.Collection;
import java.util.Iterator;
import java.util.List;
import java.util.Map;
/**
* Implementation of PropertyAccessor that uses numbers and dynamic subscripts as properties to
* index into Lists.
*
* @author Luke Blanshard ([email protected])
* @author Drew Davidson ([email protected])
*/
public class ListPropertyAccessor extends ObjectPropertyAccessor implements PropertyAccessor{
@Override
public Object getProperty(Map context,Object target,Object name) throws OgnlException{
List list = (List) target;
if (name instanceof String){
Object result = null;
if (name.equals("size")){
result = new Integer(list.size());
}else{
if (name.equals("iterator")){
result = list.iterator();
}else{
if (name.equals("isEmpty") || name.equals("empty")){
result = list.isEmpty() ? Boolean.TRUE : Boolean.FALSE;
}else{
result = super.getProperty(context, target, name);
}
}
}
return result;
}
if (name instanceof Number){
return list.get(((Number) name).intValue());
}
if (name instanceof DynamicSubscript){
int len = list.size();
switch (((DynamicSubscript) name).getFlag()) {
case DynamicSubscript.FIRST:
return len > 0 ? list.get(0) : null;
case DynamicSubscript.MID:
return len > 0 ? list.get(len / 2) : null;
case DynamicSubscript.LAST:
return len > 0 ? list.get(len - 1) : null;
case DynamicSubscript.ALL:
return new ArrayList(list);
}
}
throw new NoSuchPropertyException(target, name);
}
@Override
public void setProperty(Map context,Object target,Object name,Object value) throws OgnlException{
if (name instanceof String && ((String) name).indexOf("$") < 0){
super.setProperty(context, target, name, value);
return;
}
List list = (List) target;
if (name instanceof Number){
list.set(((Number) name).intValue(), value);
return;
}
if (name instanceof DynamicSubscript){
int len = list.size();
switch (((DynamicSubscript) name).getFlag()) {
case DynamicSubscript.FIRST:
if (len > 0){
list.set(0, value);
}
return;
case DynamicSubscript.MID:
if (len > 0){
list.set(len / 2, value);
}
return;
case DynamicSubscript.LAST:
if (len > 0){
list.set(len - 1, value);
}
return;
case DynamicSubscript.ALL:{
if (!(value instanceof Collection)){
throw new OgnlException("Value must be a collection");
}
list.clear();
list.addAll((Collection) value);
return;
}
}
}
throw new NoSuchPropertyException(target, name);
}
@Override
public Class getPropertyClass(OgnlContext context,Object target,Object index){
if (index instanceof String){
String indexStr = (String) index;
String key = (indexStr.indexOf('"') >= 0 ? indexStr.replaceAll("\"", "") : indexStr);
if (key.equals("size")){
return int.class;
}else{
if (key.equals("iterator")){
return Iterator.class;
}else{
if (key.equals("isEmpty") || key.equals("empty")){
return boolean.class;
}else{
return super.getPropertyClass(context, target, index);
}
}
}
}
if (index instanceof Number){
return Object.class;
}
return null;
}
@Override
public String getSourceAccessor(OgnlContext context,Object target,Object index){
String indexStr = index.toString();
if (indexStr.indexOf('"') >= 0){
indexStr = indexStr.replaceAll("\"", "");
}
if (String.class.isInstance(index)){
if (indexStr.equals("size")){
context.setCurrentAccessor(List.class);
context.setCurrentType(int.class);
return ".size()";
}else{
if (indexStr.equals("iterator")){
context.setCurrentAccessor(List.class);
context.setCurrentType(Iterator.class);
return ".iterator()";
}else{
if (indexStr.equals("isEmpty") || indexStr.equals("empty")){
context.setCurrentAccessor(List.class);
context.setCurrentType(boolean.class);
return ".isEmpty()";
}
}
}
}
// TODO: This feels really inefficient, must be some better way
// check if the index string represents a method on a custom class implementing java.util.List instead..
if (context.getCurrentObject() != null && !Number.class.isInstance(context.getCurrentObject())){
try{
Method m = OgnlRuntime.getReadMethod(target.getClass(), indexStr);
if (m != null){
return super.getSourceAccessor(context, target, index);
}
}catch (Throwable t){
throw OgnlOps.castToRuntime(t);
}
}
context.setCurrentAccessor(List.class);
// need to convert to primitive for list index access
// System.out.println("Curent type: " + context.getCurrentType() + " current object type " + context.getCurrentObject().getClass());
if (!context.getCurrentType().isPrimitive() && Number.class.isAssignableFrom(context.getCurrentType())){
indexStr += "." + OgnlRuntime.getNumericValueGetter(context.getCurrentType());
}else if (context.getCurrentObject() != null && Number.class.isAssignableFrom(context.getCurrentObject().getClass())
&& !context.getCurrentType().isPrimitive()){
// means it needs to be cast first as well
String toString = String.class.isInstance(index) && context.getCurrentType() != Object.class ? "" : ".toString()";
indexStr = "ognl.OgnlOps#getIntValue(" + indexStr + toString + ")";
}
context.setCurrentType(Object.class);
return ".get(" + indexStr + ")";
}
@Override
public String getSourceSetter(OgnlContext context,Object target,Object index){
String indexStr = index.toString();
if (indexStr.indexOf('"') >= 0){
indexStr = indexStr.replaceAll("\"", "");
}
// TODO: This feels really inefficient, must be some better way
// check if the index string represents a method on a custom class implementing java.util.List instead..
/*
* System.out.println("Listpropertyaccessor setter using index: " + index + " and current object: " + context.getCurrentObject()
* + " number is current object? " + Number.class.isInstance(context.getCurrentObject()));
*/
if (context.getCurrentObject() != null && !Number.class.isInstance(context.getCurrentObject())){
try{
Method m = OgnlRuntime.getWriteMethod(target.getClass(), indexStr);
if (m != null || !context.getCurrentType().isPrimitive()){
// System.out.println("super source setter returned: " + super.getSourceSetter(context, target, index));
return super.getSourceSetter(context, target, index);
}
}catch (Throwable t){
throw OgnlOps.castToRuntime(t);
}
}
/*
* if (String.class.isInstance(index))
* {
* context.setCurrentAccessor(List.class);
* return "";
* }
*/
context.setCurrentAccessor(List.class);
// need to convert to primitive for list index access
if (!context.getCurrentType().isPrimitive() && Number.class.isAssignableFrom(context.getCurrentType())){
indexStr += "." + OgnlRuntime.getNumericValueGetter(context.getCurrentType());
}else if (context.getCurrentObject() != null && Number.class.isAssignableFrom(context.getCurrentObject().getClass())
&& !context.getCurrentType().isPrimitive()){
// means it needs to be cast first as well
String toString = String.class.isInstance(index) && context.getCurrentType() != Object.class ? "" : ".toString()";
indexStr = "ognl.OgnlOps#getIntValue(" + indexStr + toString + ")";
}
context.setCurrentType(Object.class);
return ".set(" + indexStr + ", $3)";
}
}